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Pore formation and melt pool analysis of laser welded Al-Cu joints using synchrotron radiation
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2022-07-29 , DOI: 10.1016/j.jmatprotec.2022.117738
S. Hollatz , M. Hummel , A. Olowinsky , A. Gillner , F. Beckmann , J. Moosmann

Known as challenging material combination, the welding of aluminium and copper, both with strongly different thermophysical properties, causes joining failures such as pores, cracks or intermetallic phases in the solidified welding area. To investigate the mixing of the materials and the occurrence of pores, the laser welding process is observed with synchrotron radiation which visualizes the phase boundaries between solid, liquid and gaseous material phases. This allows the visualization of pore formation and density differences of the materials inside the melt pool. In this investigation, pore formation in front and bottom of the keyhole is observed. The movement of the bubbles in the melt pool can be tracked until solidification at the material transition. Regarding the intermixing of the materials, the high-speed images show a fluctuating copper flow towards the keyhole and a material mixing over the entire aluminium melt pool depth. By understanding the mechanisms, compensatory measures for an improved process can be developed to enable the usability of aluminium and copper connections, for example in electromobility applications.



中文翻译:

使用同步辐射的激光焊接铝铜接头的气孔形成和熔池分析

被称为具有挑战性的材料组合,铝和铜的焊接具有强烈不同的热物理特性,会导致焊接失败,例如凝固焊接区域中的气孔、裂纹或金属间化合物相。为了研究材料的混合和气孔的出现,使用同步加速器辐射观察激光焊接过程,该辐射可视化固态、液态和气态材料相之间的相界。这允许可视化熔池内材料的孔隙形成和密度差异。在本次调查中,观察到小孔前面和底部的孔隙形成。可以跟踪熔池中气泡的运动,直到在材料转变处凝固。关于材料的混合,高速图像显示了朝向锁孔的波动铜流和整个铝熔池深度的材料混合。通过了解这些机制,可以开发出改进工艺的补偿措施,以实现铝和铜连接的可用性,例如在电动汽车应用中。

更新日期:2022-07-29
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